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$89+ Cheap flights from Ontario to Boston (ONT - BOS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOS
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Boston Logan Intl are usually found in September or August, booked 45 days in advance, depart on a Tuesday or Saturday and return on a Tuesday

Cheap flight deals from Ontario to Boston

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Boston (BOS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 3, 2025.

Round-trip from

$264
(Frontier)

One-way from

$89
(Priceline)

Popular in

June

Cheapest in

September

Average price

$464
From Ontario to Boston Logan Intl
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One-way flight from Ontario to Boston Logan Intl
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Highest demand for flights based on searches. 9% potential increase in price ($41 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Ontario to Boston

Cheapest flights from Ontario to Boston
Explore the most affordable flight options available from Ontario to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

This Frontier deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/78:09 pmONT - BOS
1 stop11h 49mFrontier
Thu 8/1412:57 pmBOS - ONT
2 stops13h 53mFrontier
Deal found 6/30$264
This Trip.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1011:59 pmONT - BOS
1 stop9h 16mJetBlue
Fri 8/151:59 pmBOS - ONT
1 stop11h 11mJetBlue
Deal found 7/3$289
This Delta deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/3011:45 amONT - BOS
1 stop8h 29mDelta
Fri 9/55:20 pmBOS - ONT
1 stop8h 20mDelta
Deal found 7/3$305
This Alaska Airlines deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/315:49 pmONT - BOS
1 stop9h 11mAlaska Airlines
Fri 9/55:37 pmBOS - ONT
1 stop9h 17mAlaska Airlines
Deal found 7/3$312
This American Airlines deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1512:47 pmONT - BOS
1 stop7h 29mAmerican Airlines
Fri 8/225:55 amBOS - ONT
1 stop8h 57mAmerican Airlines
Deal found 7/1$314
This United Airlines deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/151:34 pmONT - BOS
1 stop7h 21mUnited Airlines
Sat 8/236:09 amBOS - ONT
2 stops9h 23mUnited Airlines
Deal found 7/1$318
This Southwest deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/712:00 pmONT - BOS
1 stop7h 35mSouthwest
Sat 10/115:20 amBOS - ONT
1 stop8h 20mSouthwest
Deal found 7/2$325

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Boston that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 3, 2025.
Use the filters below to find and compare flights from Ontario to Boston that are best for you.

Fly from

Ontario

Fly to

Boston

Route

Depart

Return

Price

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Thu 8/7

8:09 pm-10:58 am

1 stop11h 49m

Boston Logan Intl

Thu 8/14

12:57 pm-11:50 pm

2 stops13h 53m

$264

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sun 8/10

11:59 pm-12:15 pm

1 stop9h 16m

Boston Logan Intl

Fri 8/15

1:59 pm-10:10 pm

1 stop11h 11m

$289

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sat 8/30

11:45 am-11:14 pm

1 stop8h 29m

Boston Logan Intl

Wed 9/3

5:20 pm-10:40 pm

1 stop8h 20m

$305

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sun 8/31

5:49 pm-6:00 am

1 stop9h 11m

Boston Logan Intl

Fri 9/5

5:37 pm-11:54 pm

1 stop9h 17m

$312

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Fri 8/15

12:47 pm-11:16 pm

1 stop7h 29m

Boston Logan Intl

Fri 8/22

5:55 am-11:52 am

1 stop8h 57m

$314

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Fri 8/15

1:34 pm-11:55 pm

1 stop7h 21m

Boston Logan Intl

Sat 8/23

6:09 am-12:32 pm

2 stops9h 23m

$318

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Tue 10/7

12:00 pm-10:35 pm

1 stop7h 35m

Boston Logan Intl

Sat 10/11

5:20 am-10:40 am

1 stop8h 20m

$325

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Thu 8/7

8:09 pm-10:58 am

1 stop11h 49m

$89

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sat 8/30

10:50 am-11:16 pm

1 stop9h 26m

$127

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sat 8/30

6:50 pm-9:56 am

2 stops12h 06m

$132

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 15 results
1
2

Best time to book a flight from Ontario to Boston

Have a flexible travel schedule? Discover the best time to fly to Boston from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Boston

How far ahead should I book a flight from Ontario to Boston?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Boston. Price data was last updated on June 27, 2025.

Booking 45 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Ontario to Boston?

Currently, January is the cheapest month in which you can book a flight from Ontario to Boston (average of $218). Flying from Ontario to Boston in June is currently the most expensive (average of $306). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to BOS?

Find hourly flight availability from Ontario to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

It’s optimal to fly from Ontario to Boston in the afternoon. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Ontario to Boston?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Boston. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Boston flight should consider departing on Saturday at noon when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Boston

Get insights into the airlines that provide service to Boston. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Boston. Reviews last updated July 3, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Ontario to Boston by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,266 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,545 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Boston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Ontario to Boston round-trip?

    According to our current data, Frontier ($264), JetBlue ($289), and Delta ($305) offers the cheapest pricing from Ontario to Boston. Frontier is priced at 37% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Ontario to Boston one-way?

    $89 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on American Airlines and United Airlines, with prices starting from $127 and $132, respectively.

  • Can I find deals for flights from Ontario to Boston that include hotel bookings?

    Yes. In addition to deals on Ontario to Boston flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Boston?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Boston.

  • Can I find deals for business class flights from Ontario to Boston?

    Yes. Cheapflights offers flight deals from Ontario to Boston by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Boston?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Boston (average of $218). Flying from Ontario to Boston in June is currently the most expensive (average of $306). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Cambridge
Medford
Watertown
Warwick
Seabrook
Waltham
Framingham
Cranston
Randolph
Chestnut Hill
Chelsea
Brockton
York Beach
Saco
Burlington
West Yarmouth
Smithfield
Swansea
Lincoln
Quincy

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Top 7 airlines flying from Ontario to Boston

Discover the top 7 airlines that operate flights from Ontario to Boston. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$131Average$328FlexibilityNo cancel feeOn-time75%
Spirit AirlinesCheapest$131Average$184FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$207Average$337FlexibilityNo cancel feeOn-time62%
DeltaCheapest$208Average$389FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$271Average$423FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$288Average$421FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$308Average$452FlexibilityNo cancel feeOn-time63%

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